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Saturday, 31 October

JEE Main 2021 · ChemistryMultiple choiceTwo statementsEasyConceptual

JEE Main 18 March 2021, Shift 2, Chemistry Q32

Question 32 of 90 in this shift, Chemistry question 2 of 30, Section A.

Given below are two statements : Statement I : Bohr’s theory accounts for the stability and line spectrum of Li+\mathrm{Li^+} ion. Statement II : Bohr’s theory was unable to explain the splitting of spectral lines in the presence of a magnetic field. In the light of the above statements, choose the most appropriate answer from the options given below :
  1. (1)Both statement I and statement II are true.
  2. (2)Both statement I and statement II are false.
  3. (3)Statement I is true but statement II is false.
  4. (4)Statement I is false but statement II is true.Official answer

Official answer

Option 4

NTA final key.

Chapter
Structure of Atom
Topic
Bohr's Atomic Theory
Idea tested
Limitations of Bohr's Model

Same topic in other shifts

All Bohr's Atomic Theory questions
  1. 2 Apr 2026, Shift 1 · Q52What is the energy (in J atom−1\mathrm{J\ atom^{-1}}) required for the following process ? Li2+(g)→Li3+(g)+e−\mathrm{Li^{2+}(g)\rightarrow Li^{3+}(g)+e^-} (Take…EasySingle correct
  2. 2 Apr 2026, Shift 2 · Q71The surface of sodium metal is irradiated with radiation of wavelength xx nm. The kinetic energy of ejected electrons is…EasyNumerical value
  3. 4 Apr 2026, Shift 1 · Q52What is the ratio of wave number of first line (lowest energy line) of Balmer series of H atomic spectrum to first line of its Brackett…MediumSingle correct
  4. 4 Apr 2026, Shift 2 · Q52The species having identical radii according to the Bohr's theory are: A. H (first orbit) B. He+\mathrm{He^+} (first orbit) C.…EasyOther
  5. 6 Apr 2026, Shift 1 · Q52If shortest wavelength of hydrogen atom in Lyman series is xx, then longest wavelength in Balmer series of He+\mathrm{He^+} is:MediumSingle correct
  6. 6 Apr 2026, Shift 2 · Q52The Bohr radius of a hydrogen like species is 70.53 pm. The species and the stationary state (nn) are respectively (Given : Hydrogen atom…EasySingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.